Mounting for rock drills



Aug. 7, 1934. J. H. JowETT ET AL MOUNTING FOR ROCK DRILLS Filed Jan. 27,1932 E Jam/qd Arm l IN V EN TOR5 HJ' Laam THEIR A TTORNEY Patented Aug.7,1934 Y r 1,968,892

UNITED STATES PATENT GFFICE 1 1,968,892 MOUNTING `non ROCK DILIILILSlJames H. Jewett, New York,j N. Y., and William A. Smith, Jr.,Phillipsbiu'g, N. J., assignors to Ingersoll-Rand Company, Jersey City,N. J., a corporation of New Jersey l 1 application January er, 192e,serial no. 589,174 comme. (o1. 2551-45) This invention relates todrilling mechanism, Secured to the guide member P .01, more Dar- 'andmore particularly to amounting for rock ticularly, to the flangeR bybolts T iS a blflke drillsof the percussive type. U to `which is.pivotallyconnected, as by means Oneobject of the invention is tostabilize the ci a bolt or rod yV, a bearing mmbel W having support andto maintain it in the correct opan integral truncated cone X which seats.rlO fil) 4eratlve position unaffected by the vibration inacorrespondingly shaped socket Y in the brackcdent to the operation ofthe rock drill. et U, Seated with one end in the bearing mem- Anotherobject is to enable the mounting to ber W is a sleeve or bushing Zhaving transverse be placed and retained in a variety of positions.apertures b to accommodate the bolt V for hold- Other objects will be inpart obvious and in ing the sleeve Z fixedly in the bearing member 65part pointed out hereinafter. W.

In the accompanying drawing illustrating `the Disposed slidably Withinthe sleeve Z is a rod invention and in which similar reference charchaving a sharp or pointed end d to engage the actors refer to similarparts, Asurface of the rock. Any suitable means may be Figure 1 is aside elevation, partly broken provided for maintaining the rod c inadjusted i9 away, of a mounting constructed in accordance position withrespect to the sleeve Z. The with the practice of the invention andshowing means illustrated consists of a set screw e `a rock drillsupported thereby. threaded-into the sleeve Z to seat against theFigures 2.and 3 are transverse views taken rod, l. l

` 'through Figure l on the lines 2 2 and 3-3 The arrangement .of thebearing member W 15 looking in the direction indicated by the arrows.and the associated elements which serve as a Figure 4 is a longitudinalsectional `vievv taken supporting device for the front end of thethrough Figure 3 on the line 44 looking in the mounting is suchy thatthe mounting may be "direction indicated by the arrows andillustratconveniently elevated or lowered by Changing `ine the manner inwhich the Supporting devices the relative positions of the sleeve z andthe to of'the mounting are secured to the mounting, rod c and also by.adjusting the bearing anguand larly with respect to the guide member P.This Figure 5' is a transverse view taken through latter mode ofadjustment may be brought about Figure 1 011 the 1in@ 55 lOOng in thedlby loosening the bolt `l to permit of oscillatory -ticnlindicatedbythe arrows. 'f movement `of the bearing with respect to the 18.5

f-l Referrin'gmore particularly to the drawing, A bracket U and thebearing may be securelydesignates; lll general, the mounting, B 2 IOCllclamped to the bracket by again tightening the "drill,` and C a carriagefor the rock drill and bolt. c

which is slidably disposed on the mounting A. The bracket U ispreferably arranged Closely `The rock drill B may COIIIDIS@ th@ UsualCyln adjacent the front end of the guide member P 80 `incler D' andfront and back headS E and F which is in the form .of a pointer fadapted to which may be SeCllledtO the Cylldl D by Side .engage thesurface of the `rock K in order to as?4 rods Cir-arranged on oppositeSides 0f the lOCk sist `in maintaining that .end of the mounting l bythe nuoro of the drift.

`drill. Disposed in the front head E is a drill inlsupstantiallyfixedposition.

steel H against Which the hammer 121515011 (not For convenienceofillustration, the pointer f @.5 shown) `of the rock drill striles'fordrilling a ,is Shown as. being an integral part of the guide hole J inthe IOck Kat thevelld 0f 2J drift L member. It Will be readilyunderstood, however, "wherein the drilling mechanism lS arranged thatsaid pointer `may consist 0i a separate piece and, `as shown in Figure`1, supported in part and be anixed to the guidemember in such wise .fr Y`that .it may convenientlyv removed for re- 1.00

The mounting A constructed in accordance lplacement.or repairs whennecessary. `with the practice of theinvention, comprises a l Suitablemeans are provided for supporting guide member P of structural shapesuch as a 'the rear end of the guide member P; The T-bar 'having theusual smooth unbrokenlateral means illustrated comprises a trunnion ghaving flanges Qand adepending iiange R arranged aA pair of integrallaterally extending Wings It "105 `.pe'rpendicularly thereto." Theflanges Q serve as which are suitably spaced to receivetherebethefguiding portion of the guide member? and tween'the rear endof the flange R. The wings .extend into slots orgudevvays S of`thecarriage h may be clamped to the ilange R, by means C .whichisadapted'to slide on the guide memof boltsi, or otherwise; l Vloer l?,A`The opposite ends 1c .of the trunnion g are of H0 cylindrical shape andserve as bearings for sleeves or bushings o. Each bushing has a coniformsocket Y in the side thereof to accomodate the cone X of a bearingmember W which may be similar in all essential respects to theequivalent means described in connection with the supporting device atthe front end of the guide member P. Each bushing o has a slot p whichextends entirely through the wall of the bushing. Y

In the portions of a bushing lying on opposite sides of the slot p arealigned apertures q for the reception of a clamping bolt 1' whichextends through the bearing member W to secure said bearing member tothe bushing. The apertures q are so arranged with respect to theinterior of the bushing that a portion of the bolt r lies within anannular groove s in the trunnion g to revent longitudinal movement ofthe bushing on the trunnion although allowing the bushing o to rotate onthe trunnion upon loosening of the bolt r. The arrangement is such that,upon tightening of the bolt r, the bushing o will be clamped securely.upon the trunnion g and the bearing member W will be clamped xedly tothe bushing o.

In order to enable the rear end of the guide member P to be lowered to adegree beyond that which the sleeve Z and the rod c will permit,additional support means are provided which, in another position of thebushings o and the bearing members W, may serve' as a support for thatend of the guide member P. The means provided for this purpose comprisesin the present instance a plate t which seats against the bearingmembers W and to which it is clamped by the bolts 1. The plate t isprovided at its ends with a pair of prongs or pointers u which may be,as shown, integral portions of the plate t and are arranged at rightangles with respect thereto.

As may be readily appreciated, apparatus of the type to which thepresent invention pertains is subjected to vibratory movement of such anextent that, at best, it is a dimcult matter to maintain the drillingmechanism in the correct operative relationship with respect to thework, such as the rock K. It is therefore desirable that :na-2ans beprovided to assure stability of the mounting and, in particular, toprevent the mounting from being thrust or forced away from the work.

The means provided to accomplish this result comprises a screw jackdesignated in general by n and which may seat with one end against aroof w of the drift L and with its other end Vloosely against themounting, as for instance, on the trunnion g. In its operativerelationship the screw jack c is arranged in an inclined position. Itconsists of a bar a: having a rounded end y to seat in a socket e in thetrunnion y. The opposite end of the bar .r is provided with threads 2for yengagement with the threaded aperture `3 of a sleeve 4 clamped to ahollow pointer 5 which is seated againstthe roof w. The bar a: may, asshown, be provided with a collar 6 affixed thereto and having apertures'7 into which an instrument, such as a rod 8, may be inserted forrotating the bar x.

In order that the rock drill B may at all times be maintained in aposition to assure the most effective force of the hammer piston of thedrill against `the drill steel H the carriage C is shown provided withrecoil arresting mechanism designated in its entirety by 9. The recoilarrestdevice may be of a known type which, described briefly, mayconsist of a link 10 loosely extending into an aperture 11 in the rearend of the carriage C.

On the link 10 are a pair of hooks 12 which are adapted to grip theflanges Q to prevent the drill and the carriage from rebounding when thepiston reverses in the ends of the cylinder D. The link 10 is shiftableto limiting positions so that the rock drill B may be either advancedtowards the work or retracted therefrom.

The means whereby the link 10 is shifted manually to its limitedpositions comprises a rod 13 extending through the link with springs 14mounted on the rod 13 and being located on opposite sides of the link.The springs 14 act with their adjacent ends against the link and againstabutments on the rod, one spring seating against a nut l5 threaded onthe end of the rod to retain the springs 14 thereon, and the otherspring 14 against a shoulder 16 of a head 17 on the bolt 13. The rod 13and, therefore, the link l0 may be shifted to the different positions bymeans of an eccentric 18 journaled in the carriage C and which isconnected to the head 17 in a well known manner.

Inasmuch as the recoil arresting device 9 forms no part of the presentinvention, but is shown merely to illustrate one manner in which therock drill B may be actuated on its support, it is thought that a detaildescription thereof is unnecessary.

The manner in which the mounting A may be adjusted to a desiredoperative position, as for` instance that illustrated in Figure 1, is asfollows: The mounting is rst disposed in substantially the desiredposition with respect to the rock K and in such wise that the point fabuts the rock face. The mounting is then raised or lowered on the rodsc to the desired position after which the screws e are tightened to lockthe sleeves Z xedly to the rods c.

The rear supporting device is preferably inclined somewhat so that,during the subsequent operation of the drilling mechanism, the jarsresulting therefrom will tend to cause the pointed ends d of therearmost rods c to firmly engage the rock surface upon which they seat.The screw jack c may then be placed on the trunnion g with one end andwith its pointed end against the roof w. Thereafter the bar :c isrotated in the required direction to force the pointer 5 into firmengagement with the roof w. In this way the mounting will be heldsecurely in position and unaffected by the vibrations incident todrilling. The screw jack v will then act to press the pointer f rmlyagainst the rock and also to maintain the rear rods c seated rmly uponthe door of the drift L.

From the foregoing it will be apparent that the mounting may beconveniently lowered or elevated at will and that it may also be readilyreleased from a given position by merely unscrewing the bar m. This isthe mode of usage fory drilling all such holes as may be convenientlydrilled by adjusting the mounting only on the rods e. In such cases,however, where it is ,contemplated to drill holes closely to the floorof the drift the bearing W at the front end of the mounting may beoscillated about its pivot untilit lies substantially parallel to andbeneath the guide member P. The rear supporting devicesv may then berotated about their pivot,

that is, about the trunnion g and the rear end of the mounting may belowered to rest upon the pointers u. In this position of the parts andwith the rear portion of the mounting supported by the pointer u thescrew jack 'u may also be interposed between the trunnion y and the roofw to hold the mounting securely in the desired position.

In practice, the present invention has been found to be highly practicaland efficient. It provides a convenient means for supporting apercussive tool such as a rock drill and lends itself for use in avariety of positions so that i holes may be drilled into the rock eitherperpendicularly thereto or in inclined positions, depending upon therequirements of the work. The device may, moreover, also be used iordrilling vertical holes, and in which position, of course, the Weightoi: the apparatus may rest upon the pointer f. The rear supportingdevice including the rod c and the screw jack c may then serve, in themanner explained, to stabilize the rear end of the mounting.

We claim:

l. A mounting for a rock drill, comprising a guide member having smoothunbroken guide flanges coextensive therewith and whereon the rock drillis slidably mounted, means at one end of the guide member to seatagainst a rock surface, a pivot member on the guide member and having asocket, means pivotally mounted on the pivot member to support the otherend of the guide member, and a screw-jack seated with one end in thesocket for applying pressure to the guide member for maintaining the rstsaid means in rm engagement with the rock surface.

2. A mounting for a rock drill, comprising an elongated guide memberWhereon the rock drill is slidably mounted, a leg pivotally connected tothe front end of the guide member and being adapted to assume a positionparallel with and beneath the guide member, legs connected to the rearend of the guide member and being extensible and adjustable angularlyWith respect to the guide member, a pointer on the front end of theguide member and being integral therewith, and a screw-jack actingagainst the other end of the Vguide member to press the pointer into rmengagement with a rock face.

3. A mounting for a rock drill, comprising an elongated guide member ofstructural shape Whereon the rock drill is slidably mounted, a pointerat the front end ofthe guide member, front and rear extensible supportdevices secured to the guide member and being adjustable angularly withrespect to the guide member, said front support device being adapted toassume a position parallel With and beneath the guide member, ascrew-jack acting against the rear end of the guide member to press thepointer firmly into engagement with a rock surface, and a pair of legsaflixed to the rear Support device and being arranged laterally thereof.

JAMES H. JOWET'I.

WILLIAM A. SMITH, JR.

